@before-enter，在隱藏後，點擊讓它顯示的時候，顯示之前會觸發。@enter不同，是在動畫執行的過程中觸發。done觸發完成之後就是@after-enter。這些是通過js鉤子來實現，也就是js來實現的：
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" type="text/css" href="./animate.css">
<script src="./vue.js"></script>
<!-- <script src="http://cdn.staticfile.org/vue/2.6.10/vue.common.dev.js"></script> -->
</head>
<body>
<div id="root">
//自定義class名字：
<transition
name="fade"
@before-enter="handleBeforeEnter"
@enter="handleEnter"
@after-enter="handleAfterEnter"
>
<div v-show="show">hello</div>
</transition>
<button @click="handleClick">切換</button>
</div>
<script type="text/javascript">
var vm = new Vue({
el: "#root",
data: {
show: true
},
methods: {
handleClick: function() {
this.show = !this.show
},
//el指的是動畫包裹的標籤
handleBeforeEnter: function(el) {
//console.log("handleBeforeEnter")
//在標籤從隱藏點擊顯示的時候，變成了紅色
el.style.color = "red"
},
//接收兩個回調函數，el同上，done
handleEnter: function(el, done) {
//之前顯示是紅色，兩秒後變成綠色
setTimeout(()=>{
el.style.color = "green"
}, 2000)
setTimeout(()=>{
//但4秒才告訴vue結束(也就是2秒後變綠，又4-2秒後變黑)
done() //這個done很重要，執行完之後要告訴vue，已經執行完
}, 4000)
},
handleAfterEnter: function(el) {
el.style.color = "black"
}
}
});
</script>
</body>
</html>當然，除了入場動畫，還有出場動畫：
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" type="text/css" href="./animate.css">
<script src="./vue.js"></script>
<!-- <script src="http://cdn.staticfile.org/vue/2.6.10/vue.common.dev.js"></script> -->
</head>
<body>
<div id="root">
//自定義class名字：
<transition
name="fade"
@before-leave="handleBeforeLeave"
@leave="handleLeave"
@after-leave="handleAfterLeave"
>
<div v-show="show">hello</div>
</transition>
<button @click="handleClick">切換</button>
</div>
<script type="text/javascript">
var vm = new Vue({
el: "#root",
data: {
show: true
},
methods: {
handleClick: function() {
this.show = !this.show
},
//el指的是動畫包裹的標籤
handleBeforeLeave: function(el) {
//console.log("handleBeforeLeave")
//在標籤從隱藏點擊顯示的時候，變成了紅色
el.style.color = "red"
},
//接收兩個回調函數，el同上，done
handleLeave: function(el, done) {
//之前顯示是紅色，兩秒後變成綠色
setTimeout(()=>{
el.style.color = "green"
}, 2000)
setTimeout(()=>{
//但4秒才告訴vue結束(也就是2秒後變綠，又4-2秒後變黑)
done() //這個done很重要，執行完之後要告訴vue，已經執行完
}, 4000)
},
handleAfterLeave: function(el) {
setTimeout(()=>{
el.style.color = "black"
}, 2000)
}
}
});
</script>
</body>
</html>使用velocity。下載地址：http://velocityjs.org/
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" type="text/css" href="./animate.css">
<script src="./vue.js"></script>
<script src="./velocity.js"></script>
<!-- <script src="http://cdn.staticfile.org/vue/2.6.10/vue.common.dev.js"></script> -->
</head>
<body>
<div id="root">
//自定義class名字：
<transition
name="fade"
@before-enter="handleBeforeEnter"
@enter="handleEnter"
@after-enter="handleAfterEnter"
>
<div v-show="show">hello</div>
</transition>
<button @click="handleClick">切換</button>
</div>
<script type="text/javascript">
var vm = new Vue({
el: "#root",
data: {
show: true
},
methods: {
handleClick: function() {
this.show = !this.show
},
//el指的是動畫包裹的標籤
handleBeforeEnter: function(el) {
el.style.opacity = 0;
},
//接收兩個回調函數，el同上，done
handleEnter: function(el, done) {
//注意，要加上complete: done告訴vue結束
Velocity(el, {opacity:1}, {duration: 1000, complete: done})
},
handleAfterEnter: function(el) {
alert("動畫結束")
}
}
});
</script>
</body>
</html>